iodev.h (2242B) - Raw
1 /*- 2 * Copyright (c) 2015 The FreeBSD Foundation 3 * 4 * This software was developed by Andrew Turner under 5 * sponsorship from the FreeBSD Foundation. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #ifndef _MACHINE_IODEV_H_ 30 #define _MACHINE_IODEV_H_ 31 32 #define iodev_read_1(a) \ 33 ({ \ 34 uint8_t val; \ 35 __asm __volatile("ldrb %w0, [%1]" : "=&r" (val) : "r"(a)); \ 36 val; \ 37 }) 38 39 #define iodev_read_2(a) \ 40 ({ \ 41 uint16_t val; \ 42 __asm __volatile("ldrh %w0, [%1]" : "=&r" (val) : "r"(a)); \ 43 val; \ 44 }) 45 46 #define iodev_read_4(a) \ 47 ({ \ 48 uint32_t val; \ 49 __asm __volatile("ldr %w0, [%1]" : "=&r" (val) : "r"(a)); \ 50 val; \ 51 }) 52 53 #define iodev_write_1(a, v) \ 54 __asm __volatile("strb %w0, [%1]" :: "r" (v), "r"(a)) 55 56 #define iodev_write_2(a, v) \ 57 __asm __volatile("strh %w0, [%1]" :: "r" (v), "r"(a)) 58 59 #define iodev_write_4(a, v) \ 60 __asm __volatile("str %w0, [%1]" :: "r" (v), "r"(a)) 61 62 #endif /* _MACHINE_IODEV_H_ */